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One of the promising enhanced features introduced in LTE-Advanced is relaying. Coverage extensions as well as enhanced throughput gain are attractive from the perspective of network operators. While functioning in the macro-overlaid network, relay offers the flexibility of random deployment (nomadic relay) at places where the communication link is congested due to an occasional event (e.g. festival)...
The migration of railway communication technology from GSM-based to LTE-based has been decided by International Union of Railway. This means that a future train control system will be one based on LTE accordingly. For the highest reliability of train operation in such a system, a fully duplicated network structure with overlaid radio cells is needed. Existing methods and results are often relied on...
Estimating energy consumption and data rate in LTE networks is a critical issue for some recently proposed applications such as collaborative Internet access and energy-aware cellular data scheduling. In this study, after collecting data via empirical measurements, we provide realistic modeling with respect to LTE signal parameters such as RSRP, RSRQ and SINR. We applied various regression methods...
In this paper, we propose a novel mixed-signal cancellation circuit for LTE carrier aggregation receivers targeting modulated spur interference. This circuit senses interference via an auxiliary analog path, and generates a reference signal for the adaptive digital cancellation. To evaluate the performance of the proposed technique, a demonstrator, realized in 28 nm LP CMOS, is shown with a cancellation...
The combination of Device-to-Device (D2D) Communication in 5G Cellular Networks and vehicular networks will not only increase the performance of vehicular networks, but also increase the revenues for network operators and services providers. This paper proposes a 5G D2D routing method oriented to vehicular networks, which can increase the connectivity and scalability of vehicular networks while alleviating...
This paper provides a methodology to study the PHY layer vulnerability of wireless protocols in hostile radio environments. Our approach is based on testing the vulnerabilities of a system by analyzing the individual subsystems. By targeting an individual subsystem or a combination of subsystems at a time, we can infer the weakest part and revise it to improve the overall system performance. We apply...
The heterogeneous network concept in many respects meets customer requirements and maintains high energy efficiency. In this paper, we mainly investigate the impact of deployment efficiency of heterogeneous small cells BSs compared to the advantages of increasing the performance of wireless networks as a whole. We used well-known analytical models for calculating the values that can be obtained for...
Evolved-Multimedia Broadcast Multicast Services (eMBMS) is a set of features in LTE networks to deliver bandwidth-intensive multimedia content on a point-to-multipoint basis to subscribers. The notion of a Single Frequency Network (SFN) in eMBMS allows base stations to synchronize and transmit signals in a coordinated fashion across the same frequency-time radio resources using a common modulation...
Massive connectivity is one of the major goals of 5G mobile communications. NB-IoT systems are emerging as a way to achieve this goal. In this paper, we analyze the interferences between the LTE system and the NB-IoT system when they coexist.
The fifth generation (5G) ultra dense network (UDN) is envisioned as a very dense deployment of low power base stations where heterogeneous radio access technologies are used to satisfy the data rate demand of users employing both licensed and unlicensed spectrum. In UDN scenario, conditions of the channels operating in licensed band may exhibit intermittent characteristics due to the varying level...
This paper talks about the most problematic issues brought by interferences in the New Generation Networks and their impact on the network s data throughput with focus on the inter-cell interferences. The most important ways to avoid interferences while planning a network are mentioned. In particular frequency reuse, power control and MIMO antenna arrays. Also, interference regeneration and cancelation...
Orthogonal Frequency Division Multiplexing (OFDM) allow data to be transmitted efficiently and reliably by using multiple orthogonal subcarriers. It provides robustness against noise and corruption in the channel. The channel can be either wired or wireless depending on the particular application. Due to the close spacing of subcarriers, OFDM is susceptible to corruption caused by various narrowband...
4G Long Term Evolution (LTE) mobile system adopts Adaptive Modulation and Coding (AMC) as a link adaption mechanism that is based on the User Equipment (UE) periodically reporting channel condition summarised through Channel Quality Indicator (CQI) which, in turn, is based on Signal-to-Interference-plus-Noise Ratio (SINR) and Reference Signal Received Power (RSRP). Although CQI has a predominant role...
Digital dividend refers to the additional vacant spectrum that will be available as a result of transition from analogue to digital terrestrial television broadcasting. Wireless broadband networks such as Long-Term Evolution (LTE) can operate opportunistically in this vacant spectrum by controlling the harmful interference and overheads incurred on licensed users. With the objective of analyzing the...
Management of Interference Is the solution designing for LTE network to reduce inter symbol interference (ISI) and intercell interference (ICI) using the frequency reuse schemes which has the objective to maximize the coverage area and provide more capacity in cells, especially in cell edge. Based on those propositions, this paper analyzes the process of optimizing subcarrier and power allocation...
3GPP has recently introduced new features to the long term evolution (LTE) cellular technology enabling direct vehicle-to-vehicle (V2V) communications, also known as LTE-V2V. This new technology aims at supporting a large number of applications, most of them based on the broadcasting of periodic messages by all vehicles to inform the neighborhood about relevant information such as vehicle position,...
As the need to satisfy the global demand for wireless services continues, the pressure for valuable spectrum adjacent to radiolocation services is a topic of contention between incumbent spectrum users and national spectrum policy makers and regulators. The study of the coexistence of radar systems and modern LTE communications systems tend to focus on the measurements of the spectrum impacts of the...
Contemporary wireless communication standards, such as the long term evolution (LTE) standard, exploit several techniques, including link adaptation and frequency selective scheduling (FSS), to offer high data rate services. The efficacy of these techniques rely on the evolved Node B (eNB) having accurate channel state information through the use of a high signaling overhead process whereby channel...
The frequency resource is limited due to multiple operators and various services. It is important to reduce intra- operator interference with multiple operators that are occupied same frequency band. Sharing radio access network technology is one of promising solution for intra-operator interference. However, there is a problem that the coverage is reduced according to the handover parameter when...
In this work, decentralized coordinated scheduling in LTE-Advanced downlink networks is studied, where the base stations abstain from transmitting data on particular frequency/time resources in order to reduce the inter-cell interference experienced by users connected to neighboring base stations. The proposed decentralized scheme is derived with regard to low information exchange between the base...
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